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post #1 of 18 (permalink) Old 01-15-2019, 11:27 PM Thread Starter
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Jmod

Quick question when doing the Jmod do I take out all 3 spings ( the 2 in1-2 and the one in 3-4)?
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post #2 of 18 (permalink) Old 01-16-2019, 06:28 AM
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Now I got a quick question!

Has the transmission been touched before, new accumulators or springs?

If the accumulators are original then you want to change those and remove the original springs. Use the search and you'll find that some go with replacing the springs on the 1-2 with one (upper) or two (upper and lower). The 2-3 piston, no springs get replaced. You just go with the updated one.

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post #3 of 18 (permalink) Old 01-16-2019, 12:28 PM Thread Starter
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Thanks for the reply Trans has never been touched other then filter change. The video I watched the guy removes 2 springs in the 1-2 accumulator and leaves them out. Is this right I keep getting conflicting answers. Some are saying only take out 1 springs others say don't take out any unless you want whiplash. Which way is right never done the jmod but I'm more then willing and capable of doing it.
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post #4 of 18 (permalink) Old 01-16-2019, 12:33 PM Thread Starter
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I'm asking about the lower springs by the way sorry didn't clarify that in the original post
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post #5 of 18 (permalink) Old 01-17-2019, 05:17 AM
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I'll have to watch the video. But you remove the old springs and piston for the 1-2, then replace the upper spring, new piston, and if you want you can add a lower spring.

I did mine years ago with only the upper spring for the 1-2 and the shift can be a bit much. I'm planning on changing the fluid in the spring and will add a lower spring .

Joe

It's not a 97 Sport, it just looks like one!

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post #6 of 18 (permalink) Old 01-17-2019, 09:32 AM Thread Starter
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Thanks Joe that helps a lot. I was getting confused with what other where doing.and saying. So you replaced the upper with an oe type spring correct? So in your opinion is leaving the spring out to harsh for a shift. Thanks again for the reply
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post #7 of 18 (permalink) Old 01-17-2019, 10:14 AM
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Quote:
Originally Posted by Delzer View Post
Thanks Joe that helps a lot. I was getting confused with what other where doing.and saying. So you replaced the upper with an oe type spring correct? So in your opinion is leaving the spring out to harsh for a shift. Thanks again for the reply
I think your questions will be answered by reading Jerry's own articles on the J-Mod ... https://www.tccoa.com/articles/tranny/index.html .

RwP

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post #8 of 18 (permalink) Old 01-17-2019, 10:19 AM Thread Starter
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I did read it, that was the main reason I joined this group so I could read it. Was just getting confused by what I seen and what other post were saying. Again thanks to Joe for his explanation
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post #9 of 18 (permalink) Old 01-17-2019, 05:45 PM
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Quote:
Originally Posted by Delzer View Post
So in your opinion is leaving the spring out too harsh for a shift.
Not harsh but it's getting old, I'm not a kid anymore!

Joe

It's not a 97 Sport, it just looks like one!

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post #10 of 18 (permalink) Old 01-17-2019, 05:50 PM
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Here's a link to the table of applications.

https://www.scribd.com/document/2644...r-Spring-Chart

The brown spring only will bark the 1-2 shift at 15 mph in a school zone. BTDT, They were pissed.


Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #11 of 18 (permalink) Old 01-17-2019, 07:24 PM Thread Starter
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You guys are great cleared up ever thing I was questioning. Looking forward to doing this mod this weekend. BROWN SPRING got it 🙂
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post #12 of 18 (permalink) Old 01-18-2019, 08:51 AM
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Interested to hear what your WOT shifts are before and after this mod.

I used to be big on the J-mod, but not any more. Our old 96 Cougar ending up with 4000 RPM WOT shifts was enough to turn me off to it. And this was with a master mechanic that has done hundreds of them doing the mod.

My 95 loved the J-mod, 5200 shifts afterwards. The 96-97's seem to be "early shifters" I guess. My 97 w/o Jmod is 4500 on the 2-3 shift.

Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles
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post #13 of 18 (permalink) Old 01-19-2019, 08:18 PM Thread Starter
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Well I think I successfully completed the jmod on my car unfortunately it snowed in Wisconsin so I haven't been able to take it out for a test drive yet but thanks again to everybody for their input
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post #14 of 18 (permalink) Old 01-19-2019, 08:25 PM
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Did you try shifting it through the gears as you added fluid to feel the gears engaging?

Waiting for the snow here, PITA!

Joe

It's not a 97 Sport, it just looks like one!

Mass. TCCoAers, Send me your info!

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post #15 of 18 (permalink) Old 01-19-2019, 08:30 PM
No, Mr. Lemmywinks, No!!!

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I don't mess with the jmod anymore; I buy a plate from PATC, and a rebuild kit with pistons. And ALL of the Sonnex parts.

For a 2002 4r70w, lol.

I'm getting 5 years out of the one I built myself.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #16 of 18 (permalink) Old 01-19-2019, 08:55 PM Thread Starter
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Yeah I put it into every gear, but without the car raised up I can't make it shift into the gears. Other then just putting it into drive, 1,2 and reverse. It did do some nice donuts in the parking lot though 🙂
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post #17 of 18 (permalink) Old 01-21-2019, 07:20 AM
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Snow donuts or dry donuts? You need to post your location in your info.

Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles
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post #18 of 18 (permalink) Old 01-21-2019, 08:54 PM Thread Starter
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Snow live in southern Wi
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